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Depth-resolved whole-field displacement measurement by wavelength-scanning electronic speckle pattern interferometry
Pablo D Ruiz1, Jonathan M Huntley, Ricky D Wildman
1Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Ashby Road, Loughborough, Leicestershire LE11 3TU, UK. p.d.ruiz@lboro.ac.uk
Applied Optics
|July 12, 2005
Summary
This study introduces a novel method using wavelength-scanning interferometry to measure displacement fields within scattering materials. This technique enables depth-resolved analysis through semitransparent surfaces, advancing optical metrology.
Area of Science:
- Optical Metrology
- Interferometry
- Materials Science
Background:
- Measuring displacement fields in scattering media is challenging.
- Existing methods often lack depth resolution or struggle with semitransparent surfaces.
Purpose of the Study:
- To demonstrate wavelength-scanning interferometry for depth-resolved displacement measurement through scattering surfaces.
- To reconstruct scattering potential and measure 3-D displacement fields.
Main Methods:
- Recording temporal speckle interferograms with a tuned laser wavelength.
- Applying Fourier transformation to reconstruct scattering potential.
- Analyzing phase changes between scans to determine out-of-plane displacement.
Main Results:
- Successfully measured depth-resolved displacement fields through semitransparent scattering surfaces.
- Reconstructed the scattering potential within the medium.
- Validated results against standard two-beam electronic speckle pattern interferometry.
Conclusions:
- Wavelength-scanning interferometry is a viable technique for non-invasive, depth-resolved displacement measurements.
- The method offers a new approach for analyzing deformation in scattering materials.
- Proof-of-principle experiment confirms the technique's effectiveness.